The Multi-Device Dual Wireless Compact Keyboard lets you connectand switch between up to three devices at a time (computer, tablet, orphone), using Bluetooth (3.0 or 5.0) or 2.4GHz wireless with 128-bit AESencryption. Smooth, responsive scissor keys include multimedia hotkeys. Windows, macOS, iOS, and Chrome OS compatible. Low batteryindicator, so you re never caught off guard. Includes two AAA batteries.Three-year warranty.